Adjustable dumbbell

ABSTRACT

An adjustable dumbbell is provided, the adjustable dumbbell includes a dumbbell body and weight plates cumulatively attached to two ends of the dumbbell body. The dumbbell body includes a handle and a mounting portion provided at two ends of the handle for connecting the weight plates, and also includes a first telescopic rod and a second telescopic rod configured for hanging the weight plates, and being penetrated inside the handle. Each of the two ends of the handle is fixedly connected with a screw transmission member, and the first telescopic rod and the second telescopic rod each is respectively connected with the screw transmission member at the two ends of the handle by screw pairs with opposite directions of rotation.

RELATED APPLICATIONS

The present disclosure claims priority to Chinese Patent Application No. 202122843109.X, filed on Nov. 19, 2021, which is incorporated herein by reference.

TECHNICAL FIELD

The present disclosure relates to the field of fitness equipment, specifically, to a dumbbell capable of adjusting the number of weight plates, and in particular, to an improvement of the telescopic structure of a telescopic rod.

BACKGROUND

The dumbbell is a kind of commonly used fitness equipment. The existing adjustable dumbbell, such as that provided in CN111450475, is provided with two retractable telescopic shafts in the dumbbell handle, and the telescopic shafts extend or retract in opposite directions from two ends of the dumbbell handle to control the number of weight plates hung on the telescopic shafts, thereby adjusting the weight of the dumbbell. In this structure, a plurality of rounds of internal threads are formed inside the dumbbell handle (or grip bar) to cooperate with the threaded grooves on the telescopic shaft to realize the telescopic shaft expansion. But since not only the process for forming the plurality of rounds of the internal threads in the inner cavity of the dumbbell handle is difficult, but also the process for manufacturing is more time-consuming and the yield is not high, such that the production efficiency of the product is limited.

SUMMARY

To this end, in view of the above problems, the present disclosure provides an adjustable dumbbell with an optimized telescopic structure.

The presents disclosure adopts the following technical scheme:

The presents disclosure provides an adjustable dumbbell, including a dumbbell body and weight plates cumulatively attached to two ends of the dumbbell body; the dumbbell body includes a handle and a mounting portion provided at two ends of the handle for connecting the weight plates, and also includes a first telescopic rod and a second telescopic rod; the first telescopic rod and the second telescopic rod are penetrated inside the handle, and are driven to move away from each other to protrude out of or retract into the dumbbell body, such that the weight plates are hung on the first telescopic rod and the second telescopic rod, to adjust a number of weight plates at the two ends of the dumbbell body; each of the two ends of the handle is fixedly connected with a screw transmission member, and the first telescopic rod and the second telescopic rod each is respectively connected with the screw transmission member at the two ends of the handle by screw pairs with opposite directions of rotation, such that when the handle is rotated forward or reversed, the first telescopic rod and the second telescopic rod are driven to extend or retract the dumbbell body away from each other, by the cooperation of the screw transmission member with the first telescopic rod and the second telescopic rod.

In an embodiment, the screw transmission member is in a ring-shaped structure, and the screw transmission member is inserted and fixed to the handle from an axial outer side of the handle.

In an embodiment, the handle is provided with a first positioning step, one end of the screw transmission member abuts on the first positioning step; the handle is further provided with a clamp spring groove at an outer periphery, the screw transmission member is further fixedly provided with a second positioning step extending along an axial direction of the screw transmission member, and a clamp spring is clamped and fixed on the clamp spring groove and abuts against the second positioning step, such that an axial positioning of the screw transmission member is realized.

In an embodiment, one end of the handle is provided with a positioning groove extending along an axial direction of the handle, the screw transmission member is fixedly provided with a third positioning step extending along a radial direction of the screw transmission member, the third positioning step is matched in the positioning grooves, such that a circumferential positioning of the screw transmission member is realized.

In an embodiment, the second positioning step and the third positioning step are integrally formed on an outer peripheral surface of the screw transmission member, to form a two-stage step.

In an embodiment, the first telescopic rod and the second telescopic rod are provided with threaded grooves, and the screw transmission member is provided with an internal thread matched with the threaded grooves.

In an embodiment, each peripheral surface of the first telescopic rod and the second telescopic rod is provided with a sliding groove opened along an axial direction thereof; the mounting portion is provided with a telescopic rod exposure hole for the first telescopic rod or the second telescopic rod extending outward, the telescopic rod exposure hole is fixedly provided with a limit block mating a shape of the sliding groove inside; and the first telescopic rod and the second telescopic rod are capable to be extended and retracted in a linear motion along the axial direction thereof, through mating the limit block inside the sliding groove.

The presents disclosure has the following beneficial effects:

the presents disclosure additionally provides an independent screw transmission member, and the screw transmission member is fixedly connected to the two ends of the handle to be connected with the first telescopic rod and the second telescopic rod for screw pair connection, such that that it is not necessary to form the threads in the inner cavity of the handle, reducing the difficulty of the process and improving the production efficiency.

BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a 3D perspective view illustrating an adjustable dumbbell provided in an embodiment;

FIG. 2 is a 3D perspective view illustrating a dumbbell body provided in the embodiment;

FIG. 3 is a sectional view illustrating the dumbbell body provided in the embodiment;

FIG. 4 is a structural exploded view illustrating the dumbbell body provided in the embodiment;

FIG. 5 is an assembly view illustrating a handle and a screw transmission member provided in the embodiment;

FIG. 6 is a 3D perspective view illustrating the screw transmission member provided in the embodiment;

FIG. 7 is a 3D perspective view of the handle provided in the embodiment.

DESCRIPTION OF EMBODIMENTS

To further illustrate the various embodiments, the present disclosure provides accompanying drawings. These drawings are a part of the disclosure of the present disclosure, which are mainly used to illustrate the embodiments, and can be combined with the relevant description of the specification to explain the operation principles of the embodiments. With reference to these contents, those of ordinary skill in the art will be able to understand other possible embodiments and the advantages of the present disclosure. Components in the figures are not drawn to scale, and similar component symbols are often used to represent similar components.

The present disclosure will now be further described with reference to the accompanying drawings and specific embodiments.

Referring to FIGS. 1-7 , as a preferred embodiment of the present disclosure, an adjustable dumbbell is provided, including a dumbbell body 10 in an “I” shape and a plurality of weight plates 20 mounted at two ends of the dumbbell body 10. The first weight plates 20 at two ends of the dumbbell body 10 are fixedly connected to the dumbbell body 10, and the other weight plates 20 can be cumulatively installed on the first weight plates 20 at two ends of the dumbbell body 10. The left and right end surfaces of each weight plate are provided with dovetail tenons and dovetail grooves symmetrically at 180° , and the accumulation of weight plates is realized through the mating connection of the dovetail tenons and dovetail grooves on the adjacent weight plates.

The dumbbell body 10 may include a handle 1, a mounting portion 2 fixedly connected to two ends of the handle 1, and a telescopic rod 3 extending inside the dumbbell body 10. Among them, the handle 1 is used to hold the dumbbell, and the telescopic rod 3 can be extended and retracted by rotating the handle 1. The mounting portion 2 is used to fix the weight plates. The telescopic rod 3 may specifically include a first telescopic rod 31 and a second telescopic rod 32. When the handle 1 is rotated, the first telescopic rod 31 and the second telescopic rod 32 move away from each other to protrude out of or retract into the dumbbell body 10 synchronously in opposite directions to hang the weight plates, such that the adjustment of the number of weight plates at two ends of the dumbbell body 10 can be achieved.

Each end of the handle 1 is fixedly connected with a screw transmission member 4, respectively, and the first telescopic rod 31 and the second telescopic rod 32 are respectively connected with the screw transmission members 4 at two ends of the handle 1 through screw pairs with opposite rotation directions. When the handle 1 is rotated forwardly or reversely, the first and second telescopic rods 31 and 32 are driven to move away from each other to protrude out of or retract into the dumbbell body 10 through the cooperation of the screw transmission member 4 and the first and second telescopic rods 31 and 32.

In the present embodiment, an independent screw transmission member 4 is additionally provided, and the screw transmission member 4 is fixedly connected to the two ends of the handle 1 to be connected with the first telescopic rod 31 and the second telescopic rod 32 for screw pair connection, such that forming the threads the inner cavity of the handle 1 is not necessary, which reduces the difficulty of the process and improves the production efficiency.

The screw transmission member 4 at one end is illustrated below as an example. The screw transmission member 4 has a ring structure. The screw transmission member 4 is inserted and fixed in the inner cavity of the handle 1 from the axial outer side of the handle 1. The handle 1 may be provided with a first positioning step 11 inside, one end of the screw transmission member 4 is abutted on the first positioning step 11. The outer periphery of the handle 1 may be further provided with a clamp spring groove 13, and the screw transmission member 4 is also fixedly provided with a second positioning step 42 extending along the axial direction of the screw transmission member 4. A clamp spring 5 is clamped and fixed on the clamp spring groove 13 and abuts against the second positioning step 42, thereby realizing the axial positioning of the screw transmission member 4. The end of the handle 1 may be provided with a positioning groove 12 extending along the axial direction of the handle 1, and the screw transmission member 4 is fixedly provided with a third positioning step 41 extending along the radial direction of the screw transmission member 4. The third positioning step 41 is matched in the positioning groove 12 to realize a circumferential positioning of the screw transmission member 4.

In the present embodiment, the screw transmission member 4 may be inserted and fixed in the inner cavity of the handle 1 from the axial outer side of the handle 1, thereby reducing the space occupied by the screw transmission member 4 in the axial direction of the handle 1 and reducing the shape volume of the dumbbell. In other embodiments, the screw transmission member 4 can also be coaxially fixed on the end of the handle 1.

In the present embodiment, the positioning method of the above-mentioned positioning steps, clamp springs and positioning grooves is adopted, which has the advantages of simple assembly process and high efficiency. In addition to the positioning structures shown in the example, common axial and circumferential positioning structures such as collars, end caps, and key connections can also be used for the screw transmission member 4 in other embodiments. In addition, it is also possible to directly fix the screw transmission member 4 and the handle 1 by means of fixed connection, such as screwing, bonding, or the like.

In the present embodiment, the second positioning step 42 and the third positioning step 41 may be integrally formed on the outer peripheral surface of the screw transmission member 4 to form a two-stage step, thereby improving the casting process of the screw transmission member 4, which is convenient for production.

Considering the difficulty of production and assembly, in the present embodiment, preferably, the first telescopic rod 31 and the second telescopic rod 32 may be provided with threaded grooves, and the screw transmission member 4 is provided with internal threads matched with the threaded grooves. Of course, in other embodiments, a threaded groove may be provided on the screw transmission member 4 conversely, and an external thread may be provided on each of the first telescopic rod 31 and the second telescopic rod 32.

In addition, the peripheral surfaces of the first telescopic rod 31 and the second telescopic rod 32 may be further provided with sliding grooves (such as the sliding grooves 321 of the second telescopic rod 32) opened along the axial direction thereof, and the mounting portion 2 is provided with a telescopic rod exposing hole 21 for the first telescopic rod or the second telescopic rod extending outward. The telescopic rod exposing hole 21 may be fixedly provided with a limit block 22 mating the shape of the above sliding groove, and the limit block 22 is matched in the sliding groove to make the first telescopic rod 31 and the second telescopic rod 32 can be extended and retracted linearly along the axial direction thereof.

Although the present disclosure has been specifically shown and described in combination with the preferred embodiment, it will be understood by those skilled in the art that, without departing from the spirit and scope of the present disclosure defined by the appended claims, various changes made to the present disclosure in form and detail all fall within the scope of the present disclosure. 

What is claimed is:
 1. An adjustable dumbbell, comprising a dumbbell body and weight plates cumulatively attached to two ends of the dumbbell body, the dumbbell body comprising a handle and a mounting portion provided at two ends of the handle for connecting the weight plates, and also comprising a first telescopic rod and a second telescopic rod, the first telescopic rod and the second telescopic rod being penetrated inside the handle, and the first telescopic rod and the second telescopic rod being driven to move away from each other to protrude out of or retract into the dumbbell body such that the weight plates are hung on the first telescopic rod and the second telescopic rod to adjust a number of the weight plates at the two ends of the dumbbell body, wherein: each of the two ends of the handle is fixedly connected with a screw transmission member, and the first telescopic rod and the second telescopic rod each is respectively connected with the screw transmission member at the two ends of the handle by screw pairs with opposite directions of rotation such that, when the handle is rotated forward or reversed, the first telescopic rod and the second telescopic rod are driven to extend or retract the dumbbell body away from each other by cooperation of the screw transmission member with the first telescopic rod and the second telescopic rod.
 2. The adjustable dumbbell according to claim 1, wherein the screw transmission member is a ring-shaped structure, and the screw transmission member is inserted and fixed to the handle from an axial outer side of the handle.
 3. The adjustable dumbbell according to claim 2, wherein the handle is provided with a first positioning step, one end of the screw transmission member abuts the first positioning step; the handle is further provided with a clamp spring groove at an outer periphery, the screw transmission member is further fixedly provided with a second positioning step extending along an axial direction of the screw transmission member, and a clamp spring is clamped and fixed on the clamp spring groove and abuts against the second positioning step such that an axial positioning of the screw transmission member is realized.
 4. The adjustable dumbbell according to claim 2, wherein one of the two ends of the handle is provided with a positioning groove extending along an axial direction of the handle, the screw transmission member is fixedly provided with a third positioning step extending along a radial direction of the screw transmission member, and the third positioning step is positioned in the positioning groove such that a circumferential positioning of the screw transmission member is realized.
 5. The adjustable dumbbell according to claim 2, wherein the handle is provided with a first positioning step, one end of the screw transmission member abuts the first positioning step; the handle is further provided with a clamp spring groove at an outer periphery of the handle, the screw transmission member is further fixedly provided with a second positioning step extending along an axial direction of the screw transmission member, and a clamp spring is clamped and fixed on the clamp spring groove and abuts against the second positioning step such that an axial positioning of the screw transmission member is realized; one of the two ends of the handle is provided with a positioning groove extending along an axial direction of the handle, the screw transmission member is fixedly provided with a third positioning step extending along a radial direction of the screw transmission member, and the third positioning step is positioned in the positioning groove such that a circumferential positioning of the screw transmission member is realized; wherein, the second positioning step and the third positioning step are integrally formed on an outer peripheral surface of the screw transmission member to form a two-stage step.
 6. The adjustable dumbbell according to claim 1, wherein the first telescopic rod and the second telescopic rod are provided with threaded grooves, and the screw transmission member is provided with an internal thread matched with the threaded grooves.
 7. The adjustable dumbbell according to claim 1, wherein each peripheral surface of the first telescopic rod and the second telescopic rod is provided with a sliding groove opened along an axial direction thereof; the mounting portion is provided with a telescopic rod exposure hole for the first telescopic rod or the second telescopic rod extending outward, the telescopic rod exposure hole is fixedly provided with a limit block mating a shape of the sliding groove inside; and the first telescopic rod and the second telescopic rod are configured to be extended and retracted in a linear motion along the axial direction thereof through mating the limit block inside the sliding groove. 